bin/pax/pax.h

   1 /*-
   2  * Copyright (c) 1992 Keith Muller.
   3  * Copyright (c) 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Keith Muller of the University of California, San Diego.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)pax.h       8.2 (Berkeley) 4/18/94
  38  * $FreeBSD: src/bin/pax/pax.h,v 1.8.2.1 2001/08/01 05:03:11 obrien Exp $
  39  * $DragonFly: src/bin/pax/pax.h,v 1.3 2006/09/27 21:58:08 pavalos Exp $
  40  */
  41
  42 /*
  43  * BSD PAX global data structures and constants.
  44  */
  45
  46 #define MAXBLK          64512   /* MAX blocksize supported (posix SPEC) */
  47                                 /* WARNING: increasing MAXBLK past 32256 */
  48                                 /* will violate posix spec. */
  49 #define MAXBLK_POSIX    32256   /* MAX blocksize supported as per POSIX */
  50 #define BLKMULT         512     /* blocksize must be even mult of 512 bytes */
  51                                 /* Don't even think of changing this */
  52 #define DEVBLK          8192    /* default read blksize for devices */
  53 #define FILEBLK         10240   /* default read blksize for files */
  54 #define PAXPATHLEN      3072    /* maximum path length for pax. MUST be */
  55                                 /* longer than the system PATH_MAX */
  56
  57 /*
  58  * Pax modes of operation
  59  */
  60 #define LIST            0       /* List the file in an archive */
  61 #define EXTRACT         1       /* extract the files in an archive */
  62 #define ARCHIVE         2       /* write a new archive */
  63 #define APPND           3       /* append to the end of an archive */
  64 #define COPY            4       /* copy files to destination dir */
  65 #define DEFOP           LIST    /* if no flags default is to LIST */
  66
  67 /*
  68  * Device type of the current archive volume
  69  */
  70 #define ISREG           0       /* regular file */
  71 #define ISCHR           1       /* character device */
  72 #define ISBLK           2       /* block device */
  73 #define ISTAPE          3       /* tape drive */
  74 #define ISPIPE          4       /* pipe/socket */
  75
  76 /*
  77  * Format Specific Routine Table
  78  *
  79  * The format specific routine table allows new archive formats to be quickly
  80  * added. Overall pax operation is independent of the actual format used to
  81  * form the archive. Only those routines which deal directly with the archive
  82  * are tailored to the oddities of the specific format. All other routines are
  83  * independent of the archive format. Data flow in and out of the format
  84  * dependent routines pass pointers to ARCHD structure (described below).
  85  */
  86 typedef struct {
  87         char *name;             /* name of format, this is the name the user */
  88                                 /* gives to -x option to select it. */
  89         int bsz;                /* default block size. used when the user */
  90                                 /* does not specify a blocksize for writing */
  91                                 /* Appends continue to with the blocksize */
  92                                 /* the archive is currently using. */
  93         int hsz;                /* Header size in bytes. this is the size of */
  94                                 /* the smallest header this format supports. */
  95                                 /* Headers are assumed to fit in a BLKMULT. */
  96                                 /* If they are bigger, get_head() and */
  97                                 /* get_arc() must be adjusted */
  98         int udev;               /* does append require unique dev/ino? some */
  99                                 /* formats use the device and inode fields */
 100                                 /* to specify hard links. when members in */
 101                                 /* the archive have the same inode/dev they */
 102                                 /* are assumed to be hard links. During */
 103                                 /* append we may have to generate unique ids */
 104                                 /* to avoid creating incorrect hard links */
 105         int hlk;                /* does archive store hard links info? if */
 106                                 /* not, we do not bother to look for them */
 107                                 /* during archive write operations */
 108         int blkalgn;            /* writes must be aligned to blkalgn boundary */
 109         int inhead;             /* is the trailer encoded in a valid header? */
 110                                 /* if not, trailers are assumed to be found */
 111                                 /* in invalid headers (i.e like tar) */
 112         int (*id)();            /* checks if a buffer is a valid header */
 113                                 /* returns 1 if it is, o.w. returns a 0 */
 114         int (*st_rd)();         /* initialize routine for read. so format */
 115                                 /* can set up tables etc before it starts */
 116                                 /* reading an archive */
 117         int (*rd)();            /* read header routine. passed a pointer to */
 118                                 /* ARCHD. It must extract the info from the */
 119                                 /* format and store it in the ARCHD struct. */
 120                                 /* This routine is expected to fill all the */
 121                                 /* fields in the ARCHD (including stat buf) */
 122                                 /* 0 is returned when a valid header is */
 123                                 /* found. -1 when not valid. This routine */
 124                                 /* set the skip and pad fields so the format */
 125                                 /* independent routines know the amount of */
 126                                 /* padding and the number of bytes of data */
 127                                 /* which follow the header. This info is */
 128                                 /* used skip to the next file header */
 129         off_t (*end_rd)();      /* read cleanup. Allows format to clean up */
 130                                 /* and MUST RETURN THE LENGTH OF THE TRAILER */
 131                                 /* RECORD (so append knows how many bytes */
 132                                 /* to move back to rewrite the trailer) */
 133         int (*st_wr)();         /* initialize routine for write operations */
 134         int (*wr)();            /* write archive header. Passed an ARCHD */
 135                                 /* filled with the specs on the next file to */
 136                                 /* archived. Returns a 1 if no file data is */
 137                                 /* is to be stored; 0 if file data is to be */
 138                                 /* added. A -1 is returned if a write */
 139                                 /* operation to the archive failed. this */
 140                                 /* function sets the skip and pad fields so */
 141                                 /* the proper padding can be added after */
 142                                 /* file data. This routine must NEVER write */
 143                                 /* a flawed archive header. */
 144         int (*end_wr)();        /* end write. write the trailer and do any */
 145                                 /* other format specific functions needed */
 146                                 /* at the end of an archive write */
 147         int (*trail)();         /* returns 0 if a valid trailer, -1 if not */
 148                                 /* For formats which encode the trailer */
 149                                 /* outside of a valid header, a return value */
 150                                 /* of 1 indicates that the block passed to */
 151                                 /* it can never contain a valid header (skip */
 152                                 /* this block, no point in looking at it)  */
 153                                 /* CAUTION: parameters to this function are */
 154                                 /* different for trailers inside or outside */
 155                                 /* of headers. See get_head() for details */
 156         int (*rd_data)();       /* read/process file data from the archive */
 157         int (*wr_data)();       /* write/process file data to the archive */
 158         int (*options)();       /* process format specific options (-o) */
 159 } FSUB;
 160
 161 /*
 162  * Pattern matching structure
 163  *
 164  * Used to store command line patterns
 165  */
 166 typedef struct pattern {
 167         char            *pstr;          /* pattern to match, user supplied */
 168         char            *pend;          /* end of a prefix match */
 169         char            *chdname;       /* the dir to change to if not NULL.  */
 170         int             plen;           /* length of pstr */
 171         int             flgs;           /* processing/state flags */
 172 #define MTCH            0x1             /* pattern has been matched */
 173 #define DIR_MTCH        0x2             /* pattern matched a directory */
 174         struct pattern  *fow;           /* next pattern */
 175 } PATTERN;
 176
 177 /*
 178  * General Archive Structure (used internal to pax)
 179  *
 180  * This structure is used to pass information about archive members between
 181  * the format independent routines and the format specific routines. When
 182  * new archive formats are added, they must accept requests and supply info
 183  * encoded in a structure of this type. The name fields are declared statically
 184  * here, as there is only ONE of these floating around, size is not a major
 185  * consideration. Eventually converting the name fields to a dynamic length
 186  * may be required if and when the supporting operating system removes all
 187  * restrictions on the length of pathnames it will resolve.
 188  */
 189 typedef struct {
 190         int nlen;                       /* file name length */
 191         char name[PAXPATHLEN+1];        /* file name */
 192         int ln_nlen;                    /* link name length */
 193         char ln_name[PAXPATHLEN+1];     /* name to link to (if any) */
 194         char *org_name;                 /* orig name in file system */
 195         PATTERN *pat;                   /* ptr to pattern match (if any) */
 196         struct stat sb;                 /* stat buffer see stat(2) */
 197         off_t pad;                      /* bytes of padding after file xfer */
 198         off_t skip;                     /* bytes of real data after header */
 199                                         /* IMPORTANT. The st_size field does */
 200                                         /* not always indicate the amount of */
 201                                         /* data following the header. */
 202         u_long crc;                     /* file crc */
 203         int type;                       /* type of file node */
 204 #define PAX_DIR         1               /* directory */
 205 #define PAX_CHR         2               /* character device */
 206 #define PAX_BLK         3               /* block device */
 207 #define PAX_REG         4               /* regular file */
 208 #define PAX_SLK         5               /* symbolic link */
 209 #define PAX_SCK         6               /* socket */
 210 #define PAX_FIF         7               /* fifo */
 211 #define PAX_HLK         8               /* hard link */
 212 #define PAX_HRG         9               /* hard link to a regular file */
 213 #define PAX_CTG         10              /* high performance file */
 214 } ARCHD;
 215
 216 /*
 217  * Format Specific Options List
 218  *
 219  * Used to pass format options to the format options handler
 220  */
 221 typedef struct oplist {
 222         char            *name;          /* option variable name e.g. name= */
 223         char            *value;         /* value for option variable */
 224         struct oplist   *fow;           /* next option */
 225 } OPLIST;
 226
 227 /*
 228  * General Macros
 229  */
 230 #ifndef MIN
 231 #define        MIN(a,b) (((a)<(b))?(a):(b))
 232 #endif
 233 #define MAJOR(x)        major(x)
 234 #define MINOR(x)        minor(x)
 235 #define TODEV(x, y)     makedev((x), (y))
 236
 237 /*
 238  * General Defines
 239  */
 240 #define HEX             16
 241 #define OCT             8
 242 #define _PAX_           1
 243 #define _TFILE_BASE     "paxXXXXXXXXXX"